Home / 13,688.42-18,890-7,400.78

Finding the Fourth Proportional to 13,688.42, 18,890 and 7,400.78

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Solution

The fourth proportional to 13,688.42, 18,890 and 7,400.78 is: 10,213.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.42 : 18,890 = 7,400.78 : x
  2. Step 2: Convert to fraction form
    13,688.42/18,890 = 7,400.78/x
  3. Step 3: Cross multiply
    13,688.42x = 18,890 × 7,400.78
  4. Step 4: Simplify right side
    13,688.42x = 139,800,734.20
  5. Step 5: Solve for x
    x = 139,800,734.20/13,688.42
  6. Step 6: Final answer
    x = 10,213.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.